Roller bearing



FIG. 1 illustrates a front perspective view of a roller bearing.

FIG. 2 illustrates a rear perspective view of the roller bearing.

FIG. 3 illustrates a front view of the roller bearing.

FIG. 4 illustrates a back view of the roller bearing.

FIG. 5 illustrates a left side view of the roller bearing.

FIG. 6 illustrates a top view of the roller bearing; and,

FIG. 7 illustrates a bottom view of the roller bearing. 

CLAIM The ornamental design for a roller bearing, as shown and described. 